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Author Mäkelä, P. ♦ Reiner, M. J. ♦ Akiyama, S. ♦ Gopalswamy, N. ♦ Krupar, V.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ COMPARATIVE EVALUATIONS ♦ COSMIC RADIO SOURCES ♦ EMISSION ♦ INTERACTIONS ♦ MASS ♦ MHZ RANGE ♦ RADIOWAVE RADIATION ♦ SCATTERING ♦ SOLAR RADIO BURSTS ♦ SOLAR WIND ♦ SPACE ♦ SPACE VEHICLES ♦ SUN ♦ TRAJECTORIES ♦ VISIBLE RADIATION ♦ WAVE PROPAGATION ♦ WAVELENGTHS
Abstract We report on our study of radio source regions during the type II radio burst on 2013 May 22 based on direction-finding analysis of the Wind /WAVES and STEREO /WAVES (SWAVES) radio observations at decameter–hectometric wavelengths. The type II emission showed an enhancement that coincided with the interaction of two coronal mass ejections (CMEs) launched in sequence along closely spaced trajectories. The triangulation of the SWAVES source directions posited the ecliptic projections of the radio sources near the line connecting the Sun and the STEREO-A spacecraft. The WAVES and SWAVES source directions revealed shifts in the latitude of the radio source, indicating that the spatial location of the dominant source of the type II emission varies during the CME–CME interaction. The WAVES source directions close to 1 MHz frequencies matched the location of the leading edge of the primary CME seen in the images of the LASCO/C3 coronagraph. This correspondence of spatial locations at both wavelengths confirms that the CME–CME interaction region is the source of the type II enhancement. Comparison of radio and white-light observations also showed that at lower frequencies scattering significantly affects radio wave propagation.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-20
Publisher Place United States
Journal Astrophysical Journal
Volume Number 827
Issue Number 2


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